mp.3x

来自「unix v7是最后一个广泛发布的研究型UNIX版本」· 3X 代码 · 共 72 行

.TH MP 3X
.SH NAME
itom, madd, msub, mult, mdiv, min, mout,
pow, gcd, rpow \- multiple precision integer arithmetic
.SH SYNOPSIS
.nf
.B "typedef struct { int len; short *val; } mint;"
.PP
.PP
.B madd(a, b, c)
.B msub(a, b, c)
.B mult(a, b, c)
.B mdiv(a, b, q, r)
.B min(a)
.B mout(a)
.B pow(a, b, m, c)
.B gcd(a, b, c)
.B rpow(a, b, c)
.B msqrt(a, b, r)
.B mint *a, *b, *c, *m, "*q, *r;"
.PP
.B
.B sdiv(a, n, q, r)
.B mint *a, *q;
.B short *r;
.PP
.B mint *itom(n)
.SH DESCRIPTION
These routines perform arithmetic on integers of
arbitrary length.
The integers are stored using the defined type
.I mint.
Pointers to
a
.I mint
should be initialized using the function
.IR itom ,
which sets the initial value to
.IR n .
After that space is managed automatically by the routines.
.PP
.IR madd , " msub" , " mult" ,
assign to their third arguments the sum, difference, and
product, respectively, of their first two arguments.
.I mdiv
assigns the quotient and remainder, respectively,
to its third and fourth arguments.
.I sdiv
is like
.I mdiv
except that the divisor is an ordinary integer.
.I msqrt
produces the square root and remainder of its first argument.
.I rpow
calculates
.I a
raised to the power
.IR b ,
while
.I pow
calculates this reduced modulo
.IR m .
.IR min " and" mout
do decimal input and output.
.PP
The functions are obtained with the
loader option
.IR -lmp .
.SH DIAGNOSTICS
Illegal operations and running out of memory
produce messages and core images.